There's a model of the Starship Enterprise in Serge's room. Both of Edina's kids are Star Trek fans.
This was the first episode to have actual nudity in it. It was deemed too adult for the BBC and wasn't allowed to air until the nudity was faded out. Since the first showing the BBC has become more relaxed and aired the full version in 2000.
Watch Edina's hands when she comes down to the kitchen complaining to Saffy she is wearing creased clothes, she has no cigarette in her hand. When Patsy arrives and they both sit at the table Edina suddenly has a half smoked cigarette in her hand. When the shot goes back to Edina after being on Patsy for a few seconds, Edina suddenly has a new unlit cigarette in her hand.
As Patsy & Eddie run down the stairs, you can see a few flashes of light from a photographer taking their picture.
In one scene, Eddie shows Patsy what she plans to wear before she "changes." But in the next scene, she's still wearing the same thing. You can tell because of the pink neckline you can see in both scenes.
A number of objects move without being moved between takes on the kitchen table while Saffy has her friends over.